Bit



Nov. 16 1926. 1,607,502

T. O. ASHTON BIT Filed April 17, 1926 2 sne'ets-sheet 1 Nov. 16 1926. 1,607502 Y T. O. ASHTQN v BIT Filed April 1'}. 1926 2 Shee ts-She'et 2 ATTORN EY Patented Nov. 16, 1926.

entrain STATES 1,607,502 PATENT strict...

THOMAS O. ASHTON, OF wlLKEs BARRE, PENNSYLVANIA.

BIT.

Application filed April17, 1926. Serial No. 102,785.

direction of the adjacent series so that the bits will act separately and on different parts of the formation to be drilled or cut.

A further object is the provision of a drill which includes a head of a simple but novel construction and which carries a removable face plate, both the head and face plate being associated in a simple but effective manner and being-provided respectively with curved ribs for directing material therealong, while the head and the plate. are provided with pockets arranged in opposite angles with respect to each other and each of said pockets receiving therein and having in engagement therewith a bit, the sharp ened ends of the bits, of course, extending beyond the head. 7

To the attainment of the above broadly stated objects in view, the improvement further resides in certain novel features of construction, combination and operative associa- I tion of parts, a .satisfactory embodiment of which is illustrated by the accompanying drawings.

In the drawings:

Figure 1 is a face view of my improvement. t

Figure 2 is a similar view with the face plateor removable head section removed.

Figure 3 is an edge view of the device illustrated in Figure 2.

Figure 4 is a sectional view on the line 4L4 of Figure 1.

Figure 5 is a top plan view of the improvement.

Figure 6 is an outer face view of the re movable head plate.

Figure 7 is an inner face view thereof.

Figure 8 is an edge view thereof.

Figure 9 is a fragmentary perspective view of the shank of one of the cutters.

As disclosed by the drawings my improved bit includes a shank 1 having one of its edges notched, as at 2, whereby the same may be effectively sustained on the. chuck of a suitable operating device. On one end of the shank there is formed a neck enlargement 3, and the neck on one of the edges thereof is formed with an extension providing the head 4 of the improvement. There is a straight shoulder 5 between the inner fiat face of the head on the neck 3, and this shoulder has its outer portion centrally formed with a tongue extension 6. c

The head. 4 gradually widens from its juncture with the neck 3 to its outer end, and the corners of the head are rounded. Also preferably the head is both round in cross and longitudinal section. There is integrally formed on the outer face of the head 1 an angularly disposed rib 7 "of a length almost equaling that of the head.

Preferably boththe inner and outer walls of tlllS'Ilb are rounded "and therib serves as a directing element for conducting materlail cut by the bi't away from the head thereof.

To 'one side of the [rib and at a point a suitable distance from its outer end, the outer face of the head is formed with a centra lly arranged substantially rectangular depression 8 and communicating with the center of the inner wall of the said depression there is a round opening 9 that extends through the head. (9n its inner face, to the opposite sides of the opening 9 the head is formed with angularly disposed substantially V-shape'd depressions 10.0f determined lengths. These depressions enter from the outer edge of the head and the angle walls provided thereby are centrally formed with spaced cross sectional V-shaped lugs 11. These lugs are designed to be received in V-shaped notches 12 on the center or apex portion of the cross sectionally V-shaped bodies 13 of cuttersl i. One pair of cutters is arranged in the pair of depressions 10 on the head and the said cutters fully fill these depressions. Of course, the

head may be provided with any desired number of depressions 10 and consequently any desired number ofcutters.

The removable head section or the element which I shall refer to as the face plate for the head, is indicated by the numeral 15. This element corresponds in shape and size to the headet, having on its outer face a rib 16 preferably disposed at an opposite angle to that of the rib 7 and being provided with a bolt opening 17 to align with the'bolt opening 9 in the head. On its inner face the plate 15 is formed with V-shaped depressions 18 whose angle walls are integrally provided with cross sectionally V-sha-ped ribs 19 to be a received in V-shaped grooves in cutters similar to the cutters 13. A bolt member 20 has its head seated in the depression or pocket 8 and its shank passed through aligning openings in the head and the faceplate 15 for the head. This bolt is engaged by a suitable nut but in addition to holding the plate 15 on the head the inner and reduced end of said plate is notched, as at 21, and this notch receives therein the tongue 6 of the neck 3 of the head 4. The walls provided by the lug in the notch or groove 21 may be dove tailed, and it is believed that when the foregoing description has been carefully read in connection with the accompanying drawings, the simplicity of my construction and the advantages will be apparent, it being noted that the cutter elements carried by the head and the face plate for the head are disposed at opposite angles, that there is an effective engagement between the cutters and the grooves or pockets for such cutters, that the parts constituting the improvement may be easily assembled and as readily disassociated and that the device can be cheaply constructed and will prove thoroughly efficient in opera tion. Of course, I do not wish to be restricted to the details herein set forth and hold myself entitled to such changes therefrom as fairly fall within the scope of wha I claim.

Having described the invention, I claim:

1. In a device for the purpose set forth, a shank having a neck enlargement which is formed on one of its ends with a head extension and on its opposite end with a central tongue extending in the same direction as the head, a face plate resting on the shoulder, notched to receive the tongue therein, and means for removably locking the face plate on the head, said head and face plate having their confronting faces provided with series of oppositely directed substantially V-shaped pockets, cutters having V-shaped shanks received in the respective pockets, and having their cutting edges projecting beyond the head. and interengaging means between sald cutters and the walls provided by the pockets.

2. In a device for the purpose set forth, a shank having a neck enlargement which is formed on one of its ends with a head extension and on its opposite end with a central tongue extending in the same direction as the head, a face plate resting on the shoulder,

notched to receive the tongue therein, means for removably locking the face plate on the head, said head and face plate having their THOMAS O. ASHTON, 

